Coating of metals with metals of a lower fusing point



Patented get. 10, E922.

HARRY canoe enmnm'ron, or

aaaaea urea.

NORTH SYDNEY, NEW SOUTH WALES, AUSTIA.

COATIIlG OI METALS WITH METALS OF A LOWER FUSING POINT.

No Drawing.

metals or alloys. of a lower fusing point, but

exclusive of aluminium and-its alloys, and has especial reference to the coating of met-. als in sheet form.

Heretofore the methods in use for coating metals and their alloys have not been always commercially. successful inasmuch as there has been a great waste of metal and material in addition to which, considerable labor has been expended in'removing the oxides from or otherwise cleaning the metal prepara:

tory to applying the compound containing the coating metal. The present invention consists in the ess of applying coating metal.

In carrying out the process the surface of the foundation metal to be coated isipreferprocthe compound containing the ably first rubbed 'withemery paper or the' 1ke or other known mechapical means employed to remove any foreign matter but dispensing with the use .of sulphuric and iike acids or cyanides- The surface has then applied to it with a brush or the like a dressing of the coating compound which should be first well agitated, care being taken that it is evenly distributed.

and dressed and the metal passed slowly over suitable heating apparatus.- This preferably is a Bunsen burner of sufficient length to heat simultaneously the width of the metal to sheet or object.

.I clalm as new and desireto protect by Let'- consisting of powdered stearic 40 acid, is then sprinkled over the whole area Application iiled June 14, 1920. Serial No. 388,923.

When'the coating'metal becomes totally fused, say between 232 C. and 288 (l, in the case of tin, but not at so high a temperature as to' cause the stearic acid or other flux to be completely volatilized and while the foundation metal is still hot and the coating metal fluid, the surface is wiped. with a cloth or pad leaving the coating metal in close union with the foundation metal.

he coating compound consists of a proportion of the coating metal in very fine particles, ammonium or other like volatilizable chloride together with'a medium such as glycerine and a small proportion of water and preferably a volatihzable metal chloride. As 'an example, in coating a metal such as copper or brass with tin, I employ a tinning compound consisting of,

Ting in very fine particles approximately 10 parts, ammonium chloride approximately 20 parts,'glycerine approximately 15 parts,

a ua approximately 10 parts, to which I may The very fine particles of the coating metal are preferably obtained by atomization suchas by injecting a strong current of air against a jet of the molten metal...

Having thus described my invention, what ters Patent is In the coating of metals such as copper or brass or their alloys with tin', applying a dressing of tin in a fine state of division with a suitable medium to the foundation metal, sprinkling powdered stearic acid as a flux over the area dressed, applying heat until the coating metal is totally fused but prior to. the complete volatilization of the flux and then wiping the fluid coating metal with a cloth or pad substantially as described.

In testimony'whereof I have hereunto set my hand.

HARRY GREGGGRINLINTON.

d, zlnc chloride approximately parts. i 

